User blog:PokeFreak117/Mega Garchomp or Tyranitar?

As you may know, I was debating wether or not to keep gabite. I am keeping it. I also have a Pupitar in the pokemon daycare. I am going to buy ONE mega ston once I have enough, and gradually save for #2. Which should I get first, Garchompite or Tyranitarite, or does it even matter?

V.S.